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authorK. Y. Srinivasan <kys@microsoft.com>2016-11-07 00:14:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-11-07 12:01:17 +0300
commit74198eb4a42c4a3c4fbef08fa01a291a282f7c2e (patch)
tree896b7e4abbabdafdd892bbcdfeaff3dbb0258e90 /drivers/hv/ring_buffer.c
parent0c38cda64aecb4a821210bb2d3d04092c181c0ae (diff)
downloadlinux-74198eb4a42c4a3c4fbef08fa01a291a282f7c2e.tar.xz
Drivers: hv: vmbus: Base host signaling strictly on the ring state
One of the factors that can result in the host concluding that a given guest in mounting a DOS attack is if the guest generates interrupts to the host when the host is not expecting it. If these "spurious" interrupts reach a certain rate, the host can throttle the guest to minimize the impact. The host computation of the "expected number of interrupts" is strictly based on the ring transitions. Until the host logic is fixed, base the guest logic to interrupt solely on the ring state. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/ring_buffer.c')
-rw-r--r--drivers/hv/ring_buffer.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 08043da1a61c..5d11d93eedf4 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -75,13 +75,6 @@ static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi,
if (READ_ONCE(rbi->ring_buffer->interrupt_mask))
return false;
- /*
- * When the client wants to control signaling,
- * we only honour the host interrupt mask.
- */
- if (policy == HV_SIGNAL_POLICY_EXPLICIT)
- return true;
-
/* check interrupt_mask before read_index */
virt_rmb();
/*